December in Fredrikstad is the windiest month of the year. In December, the weather in Fredrikstad is typically cold. Average daily high temperature in December is about 3 degrees above zero. On average, Fredrikstad has 12 rainy, 8 partly cloudy, 6 sunny, and 5 cloudy days in December. The rains are usually moderate. December as well as January, February, March, and October is considered the most uncomfortable time to visit Fredrikstad.